A back-pressure turbine refers to a turbine where the exhaust steam pressure is greater than atmospheric pressure.
Back-pressure steam turbines can be used for heating, drying, sterilization, and other processes. When a back-pressure turbine is used to supply medium and low-pressure steam turbines to replace medium and low-pressure boilers in old power plants, it is also known as a fore-pressure turbine. This not only increases the power generation capacity of the existing power plant but also improves its thermal economy. The design pressure of the exhaust steam from a back-pressure turbine for heating varies depending on the specific heating purpose; the back pressure of a fore-pressure turbine is typically greater than 5 MPa, depending on the steam parameters of the original unit. After the exhaust steam is utilized in the heating system, it condenses into water, which is then returned to the boiler as feedwater by a pump. Generally, not all condensate from a heating system can be recovered, and make-up water is required.
Turbine structural characteristics
Structural Form: Quick Assembly Multi-Stage Steam Turbine
Arrangement Method: Single or Double Layer
Mechanical Speed Regulation: Full hydraulic adjustment; Imported TG series mechanical speed regulator;
Electronic Speed Control (Domestic or Imported): DEH Electro-hydraulic Variable Speed Controller, 505 Digital Hydraulic Speed Controller
Over-speed Protection: Mechanical hammer protection and electromagnetic valve electronic intelligent control
Sealing Type: Aluminum-carbon spring compensated gapless seal, stainless steel blade labyrinth seal, honeycomb contact seal
Primary Valve: Integrated Automatic Primary Valve (Rapid Closing Regulating Combination Valve)
Main shaft assembly: Reversible speed impeller blades, sleeve fit rotor and impeller set
Lubrication System: Oil lubrication (complimented by a joint lubrication station)
Thermal Expansion Compensation: Front bearing support with sliding thermal compensation
Electrical Configuration: Complete control cabinet, protection cabinet, main control cabinet, and matching domestic generators (voltage range 400-6300-10050V).
Parking method: Manual
